The paper includes the various broadband services and their history, various concepts of ISDN, ATM, its configuration and services, the benefits and limitations and also other technologies are discussed.

The Broadband services are defined as the services which offer maximum bandwidth for the transmission of data when compared to that of standard telephonic service. The technologies include ISDN, B-ISDN, XDSL and ATM. The quality of the service depends on the factors such as cost, data integrity, capacity utilization, security & privacy, and integration.

The broadband services came into the picture to overcome issues related to the inefficiency in phone network, as the pure analog implementation resulted in noise also breakdown, and also data transmission for longer distances was quite complex.

The term ISDN is defined as the integrated digital network which makes use of the digital switches and the paths, for providing different services ex: includes the telephonic and data. ISDN it permits voice, data, text, graphics, music, video, and also the other source material transmission which can be on existing telephone wires.

The advantage of the ISDN includes the efficient sound quality, and provides efficient features such as call hold, call waiting, caller id and so on. And also provides the voice and data transmission to occur simultaneously. It helps the multiple devices for sharing a single line. The disadvantage of ISDN includes the cost implementation for wiring, more service charges, and also includes limited availability.

The other technologies include DSL: can be referred as “Xdsl” “where “x” can stand for H, S, I, V, A, or RA. Cable modems: This makes use of coaxial cable for production of various channels. A limitation of this system involves its simplicity as it operates in only one direction i.e. downstream.

ATM stands for asynchronous transfer mode; here the data is flowed in terms of packets called cells. The data is transmitted in packets. The advantages of the ATM includes, high speed network, implementation of multiplexing is easy and offers high Qos.